<template>
  <view v-if="goods_info.goods_name" class="goods-detail-container">
    <!-- 轮播图 -->
    <swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000">
      <swiper-item v-for="(item,i) in goods_info.pics" :key="i">
        <image :src="item.pics_big" @click="preview(i)"></image>
      </swiper-item>
    </swiper>

    <!-- 商品信息区 -->
    <view class="goods-info-box">

      <!-- 商品价格 -->
      <view class="price">
        ￥{{goods_info.goods_price|tofixed}}
      </view>

      <!-- 信息主体 -->
      <view class="goods-info-body">
        <!-- 商品名称 -->
        <view class="goods-name">
          {{goods_info.goods_name}}
        </view>

        <!-- 收藏 -->
        <view class="favi">
          <uni-icons type="star" size="18" color="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>

      <!-- 运费 -->
      <view class="yf">快递:免运费</view>
    </view>

    <!-- 商品详情信息 -->
    <rich-text :nodes="goods_info.goods_introduce"></rich-text>

    <!-- 商品底部导航区域 -->
    <view class="goods_nav">
      <uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="onClick"
        @buttonClick="buttonClick" />
    </view>
  </view>
</template>

<script>
  // 从vuex中按需导出mapState辅助方法
  import {
    mapState,
    mapMutations,
    mapGetters
  } from 'vuex'

  export default {
    data() {
      return {
        // 商品详情对象
        goods_info: {},

        //商品底部导航
        options: [{
          icon: 'shop',
          text: '店铺',
          // infoBackgroundColor: '#007aff',
          // infoColor: "red"
        }, {
          icon: 'cart',
          text: '购物车',
          info: 0
        }],
        buttonGroup: [{
            text: '加入购物车',
            backgroundColor: '#ff0000',
            color: '#fff'
          },
          {
            text: '立即购买',
            backgroundColor: '#ffa200',
            color: '#fff'
          }
        ]
      };
    },

    onLoad(options) {
      // 获取商品id
      const goods_id = options.goods_id
      this.getGoodsDetail(goods_id)
    },

    methods: {
      ...mapMutations('m_cart', ['addToCart']),
      async getGoodsDetail(goods_id) {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/detail', {
          goods_id
        })
        // console.log(res);
        if (res.meta.status !== 200) {
          return uni.$showMsg()
        }

        //使用字符串的replace方法，为img标签添加行内的style样式，从而解决图片底部空白的为题
        res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g, '<img style="display:block;"')
          .replace(/webp/g, 'jpg')

        // console.log(res.message.goods_introduce);
        this.goods_info = res.message
      },

      // 实现轮播图预览效果
      preview(i) {
        // 预览图片的方法
        uni.previewImage({
          // 预览时默认显示图片的索引，用于显示第几张图片，即点击的那一张
          current: i,
          //所有图片url地址的数组
          urls: this.goods_info.pics.map(x => x.pics_big)
        })
      },

      onClick(e) {
        // console.log(e);
        if (e.content.text === '购物车') {
          // 跳转到购物车页面
          uni.switchTab({
            url: '/pages/cart/cart'
          })
        }
      },

      buttonClick(e) {
        console.log(e);
        if (e.content.text === '加入购物车') {
          const goods = {
            //购物车数据
            // {goods_id,goods_name,goods_price,goods_count,goods_small_logo,goods_state}
            // goods_state代表商品的勾选状态
            goods_id: this.goods_info.goods_id,
            goods_name: this.goods_info.goods_name,
            goods_price: this.goods_info.goods_price,
            goods_count: 1,
            goods_small_logo: this.goods_info.goods_small_logo,
            goods_state: true
          }

          //调用映射过来的addToCart方法，把商品信息对象存储到购物车中
          this.addToCart(goods)
        }
      }

    },

    filters: {
      tofixed(num) {
        return Number(num).toFixed(2)
      }
    },

    //计算属性
    computed: {
      // 调用mapState方法,把m_cart模块投射到当前页面中,作为计算属性来使用
      // ...mapState('模块名字',['要映射的数据名称1','要映射的数据名称2'])
      ...mapState('m_cart', []),
      ...mapGetters('m_cart', ['total'])
    },

    watch: {
      //监听cart里的total值的变化,但是普通写法首次加载不会执行，需要改变写法
      total: {
        handler(newVal) {
          // 找到组件中购物车
          const findResult = this.options.find((x) => x.text === '购物车')

          if (findResult) {
            // 为购物车的图标动态赋值
            findResult.info = newVal
          }
        },
        // immediate属性用于声明此监听器是否在首次加载完毕时就执行
        immediate: true
      }
    }
  }
</script>

<style lang="scss">
  swiper {
    height: 750rpx;

    image {
      width: 100%;
      height: 100%;
    }
  }

  .goods-info-box {
    padding: 10px;
    padding-right: 0;

    .price {
      color: #C00000;
      font-size: 18px;
      margin: 10px 0;
    }

    .goods-info-body {
      display: flex;
      justify-content: space-between;

      .goods-name {
        font-size: 13px;
        margin-right: 10px;
      }

      .favi {
        width: 120px;
        font-size: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        border-left: 1px solid #efefef;
        color: gray;
      }
    }

    .yf {
      font-size: 12px;
      color: gray;
      margin: 10px 0;
    }
  }

  .goods_nav {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
  }

  .goods-detail-container {
    padding-bottom: 50px;
  }
</style>